To remedy this, manufacturers can employ any number of different dyes. (blog.nkdnutrition.com)
If a brand uses different dye lots, it means that not every ball of the same color will match exactly. (geekwrapped.com)
Next they dyed the sample with 14 different dyes in a narrow emission window and excited and photoswitched the molecules with one laser. (sciencedaily.com)